Historian Theodore Mommsen wrote that Romans built a defensive wall from the Danube delta to Tyras. He wrote:
The Walls, which, three metres in height and two meters in thickness, with broad outer fosse and many remains of forts, stretch in two almost parallel lines ... from the Pruth to the Dniester ... may be also Roman.[2]
The structure is made of earthen walls and palisades, with an elevation of only three meters (which is mostly eroded away).[3]
Some historians think that the southern Trajan Wall reached the city of Tyras, when was annexed by emperor Nero.[4] Indeed, a Roman bronze coin was found during excavations that discovered evidences of the original construction in the first century[5]
Some academics such as Dorel Bondoc think that the wall was built by the Romans, because it required a great deal of knowledge and a workforce that barbarians like Athanaric did not have.[6]
Bondoc wrote that "[The Wall's] huge size means the need of considerable material and human resources, a condition that could be met only by the Roman Empire ... the period of time when it was built stretched from Constantine the Great to Valentinian I and Valens".
Some scholars, like Vasile Nedelciuc,[7] argue that the turf Wall was built initially by the Romans during Nero rule from the Prut river to Tyras, even because it has a ditch facing north. He argues that later it was enlarged by Athanaric, but only until Sasyk lagoon.
Emanuel Constantin Antoche, Marcel Tanasache, (1990) Le Vallum (Troian) de la Moldavie centrale in "Etudes Roumaines et Aroumaines". Sociétés européennes, no. 8, Paris ; Bucharest : [s.n], pp. 130-133, OCLC502610917